Woops, Sorry, I'm not sure who the original poser is, but its not Carl. RP 2008/8/19 Richard Prosser : > Carl, > > I really can't figure out how an engine "going hydraulic" would do > that sort of damage. It looks to me more likely that > > a) The valvestem broke, probably a fatigue failure. > b) The valvehead rattled around the combustion chamber for a while, > damaging the top of the piston, the head & the spark plug and possibly > other valves. > c) At some stage the valvehead got sufficiently jammed to stop the > motor and posiibly displaced the head enough to allow water in through > the head gasket. (IIRC there was water in the cylinder when the head > was removed. It could have seeped in later anyway from the > waterjacket. > > See if you can get a closeup photo of the break in the vavestem. > Fatigue breaks are quite characteristic and if that's the root cause, > you're off the hook. What you would be looking for is a series of arcs > across the surface of the broken metal caused by crack progression. > I'm sure there's some photos on the web somewhere > (http://en.wikipedia.org/wiki/Metal_fatigue shows an aluminum piece > with fatigue crack growth). > > Just an opinion of course!. > > RP > > 2008/8/19 Stephen D. Barnes : >> Vitaliy wrote: >>> Hi All, >>> >>> This is a continuation of the [EE] thread with the same subject. >>> >>> Carl Denk said: >>> >>>> Pictures would be worth a 1000 words. :) >>>> >>> >>> http://www.maksimov.org/jetski/ >>> >>> Would love to hear your thoughts! >>> >>> Sincerely, >>> >>> Vitaliy >>> >>> >>> >> Dude, that is one kick a$# jet ski motor! ;-) >> >> -- >> Regards, >> Stephen D. Barnes >> >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist